ES2335152T3 - INSTALLATION OF SEQUENTIAL LOADING OF MATERIAL BARS IN A MACHINING MACHINE. - Google Patents

Abstract

The installation has an elongated element i.e. pusher, with a front end which is intended to exert an action on one of the opposite ends of a bar to ensure a translatory movement of the bar, where the pusher is placed under a control of a device. A state of contraction is maintained, when the usable length of the pusher in state of contraction is of a sufficient value. A relative translation of sliding parts (74, 75) of the pusher is activated to obtain the state of extensions of the pusher, when the usable length is insufficient.

Description

Installation of sequential loading of bars material in a machining machine.

The invention relates to an installation for the sequential loading of material bars in a machine for machining of these bars, according to the preamble of the claim one.

In the field of mechanical manufacturing, it Meet the production of parts in automatic machines for turning, from bars of material, all proceeding to successive machining of longitudinal portions of these bars.

Facilities of the type previously mentioned are known in this field with the name of "bar suppliers" and are used to supply such automatic turning machines that are used in the Industrial production.

The functional subset that, in a machine this guy, hosts a bar is a rotary subset of noticeably tubular configuration, called spindle.

Facilities of the type previously mentioned include functional devices that allow perform different functions, among which are:

- a function that combines support actions and / or of guiding a bar, particularly during its rotation, all this along a translation offset of this bar along a guiding axis, in particular substantially coaxial to functional subset of the machine that said bar has to cross, in order to be presented to a system of Tools located on this machine:

- a storage function of a plurality of bars,

- a function of selecting and taking a bar,

- a translation offset function of the selected bar, in order to selectively originate

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the displacement of this bar in order to arrange it in a position called waiting for load,

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the fractional thrust of the bar, in particular through the machine, from said position load waiting call until a number has been made set of pieces,

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if necessary, the extraction of the machine of a bar segment that had not been used in that machine and the displacement of said bar segment not used, commonly called "blunt", until one last position, such as that of an unloading post of that segment of bar.

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This type of installation comprises an organ elongated that, called pusher:

- has an end that, called an end above, it is intended to take an action on one of the opposite ends of a bar in order to procure its displacement,

- is subject to the control of a device called the first device and capable of ensuring the movement of translation of this pusher in two opposite directions, called first sense and second sense, in order to displace the end previous and power

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in the first sense, do that this anterior end comes into contact with a first end of a bar previously aligned with the pusher, so that sumo, after the bar was fitted, for a second extreme, by the entrance of a passage that presents the machine in alignment with its spindle and into a component of the spindle, called spindle head, and at whose level said bar can  remain firmly in order to enable machining of a fraction protruding from this spindle head,

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also in the first sense, sequentially move the anterior end to displace the bar by fraction of its length, in particular in order to can be mechanized and then take products successively from this bar,

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in the second sense, extract the front end of the spindle, in order to enable a new displacement of the anterior end in the first direction towards a end of a new bar previously aligned on the end previous, namely a new cycle of loading operations and of displacement of a bar.

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If necessary, the front end of the pusher it is provided with a clamping element that, called a clamp, is destined to fit the cooperating end of the bar with the in order to obtain a temporary link in translation with this bar.

Thus, when a section of bar is not usable, can be removed from the spindle to be taken to a position called expulsion post, which allows the expulsion of the same to in order to enable a new offset of the clamp in the first felt towards one end of a new bar aligned on this clamp, namely a new cycle of loading operations and of displacement of a bar.

In the pusher two neighboring areas are distinguished, including a first pusher zone, called the anterior zone and intended to be embedded in the spindle, and a second zone of pusher that, called back zone, is attached to the device called first device.

The anterior zone has a length that is per at least enough to displace the anterior end of the pusher between the passage entrance aligned on the spindle and noticeably spindle head.

The posterior area has a length that is per at least enough to procure the link with a mechanism of Pusher maneuver.

Generally, the installation is located as possible close to the machine, which allows to limit the length total pusher and also the longitudinal dimension of the installation, otherwise this dimension corresponds longitudinal installation substantially to the total length of the pusher

Therefore, all facilities are studied and built to load bars whose maximum length is determined, all in machines whose distance it separates the entrance of the passage aligned on the spindle and the head of Spindle has a nominal value that is determined.

In order to simplify the text, the expression "the distance that separates the entrance of the passage aligned on the spindle and spindle head "is then replaced by the expression "load distance".

However, the facilities have each a certain operating range, that is, they can work with different machining machines whose nominal value of load distance can be between two limit values determined.

A given installation is therefore planned to work with a certain category of machines machining, which all have a loading distance that is between two determined limit values.

These limit values define a range of possible operating tolerance of a given installation.

The value of this tolerance interval can be a dozen centimeters.

When, for a reason that will not be exposed, the builder of a given machine increases, beyond the range of possible operating tolerance of the installation, the distance expected load for this machine, the installation builder you have the choice of modifying the existing installation or of build another capable of feeding the modified machine.

A result that the invention has the purpose to obtain is an installation of the aforementioned type that is able to continue working with a machine whose constructor increases the loading distance beyond the value of the interval of operating tolerance normally presented by facilities planned for this machine.

Another result that the invention has the purpose of obtaining lies in the simplicity of the modifications that must be provided to an existing installation to allow continue to perform its function under the conditions above mentioned.

These results are achieved through a installation according to claim 1.

Other results will be made manifest with the reading the description that follows, by way of example with reference to the attached drawing, which represents schematically:

Figure 1: side view, an installation according to the invention and a machine that is associated with this installation,

Figures 2 to 9: the pusher of the installation of Figure 1, seen laterally and locally, during different functional phases of its operation,

Figures 10 to 12: the installation pusher of figures 1 to 9, seen in local cross-section and in different operating configurations,

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Figure 13: a view according to A of the figure 12.

Referring to the drawing, you see a Installation 1 for sequential loading of material bars, called bars 2, in a machine 4 for the machining of these bars 2.

Machine 4 is only symbolized and not It will be described in detail.

Without limitation, it is seen that the installation 1 allows sequential loading of bars 2 in a functional subset 3 of machine 4.

Functional subset 3 is, for example, a spindle

It is seen that installation 1 comprises a frame 5 which, like machine 4, rests on a surface, in particular substantially horizontal, such as the ground (symbolized by a line in figure 1).

Preferably, the installation frame 5 1 rests on the floor 6 by a base (not shown) of type of height adjustable, in order to regulate the height of the installation in relation to machine 4 and, in particular, with relation to spindle 3 of this machine 4.

As previously stated, this type of installation 1 comprises an elongated organ which, called pusher 7:

- has an end that, called an end previous 8, is intended to take an action on one of the opposite ends of a bar 2, called first end 201, with in order to procure the translational displacement of that bar 2,

- is subject to the control of a device called first device 9 and able to procure the displacement of this pusher 7 in two-way translation opposites, called first sense 91 and second sense 92, in order to move the front end 8, in the first direction 91, towards the inside the machine 4 or, in the second direction 92, towards the interior of installation 1 and power

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in the first sense 91, do that this front end 8 comes into contact with the first end 201 of a bar 2 previously aligned with the pusher 7 and seek contact with this first end 201, so that, at sumo, after the bar 2 has been fitted, at the other end called second end 202, through the entry 100 of a passage 10 which presents the machine 4 in alignment with its spindle 3 and until the inside a spindle component 3, called the head of spindle 30, and at which level said bar 2 can be maintained firmly in order to enable the machining of a fraction 20 protruding from this spindle head 30,

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also in the first sense 91, sequentially move the front end 8 in order to shift bar 2 per fraction of its length, in particular in order to that can be mechanized and then take products 11 successively of this bar 2,

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in the second sense 92, remove the front end 8 of the pusher 7 from the machine 4 in order of enabling a new end offset next previous 8 in the first direction 91 towards a first end 201 of a new bar 2 previously loaded, that is, aligned previously on this previous end 8 with a view to a new cycle of loading and moving operations of a bar 2.

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If necessary, the previous end 8 of the pusher 7 is provided with a clamping element which, called  clamp (not shown in detail), is intended to fit the first end 201 of bar 2 in order to procure a link temporary in translation with this bar 2.

In such a case, the clamp is, as a rule, a clamp of the type that enables an elastic coupling with the first end 201 of bar 2.

Thus, when a section of bar 2 is not usable, can be removed from the spindle to be taken to a position called expulsion post, which allows the expulsion thereof in order to enable a new displacement of the leading end 8 in the first direction 91 towards a first end 201 of a new bar 2 previously aligned on this end previous 8, that is, a new cycle of loading operations and displacement of a bar 2 in the machine 4.

As already stated, in order to simplify the text, the expression "the distance that separates the input the entrance 100 of the passage 10 aligned on the spindle 3 and the spindle head 30 "is then replaced by the expression load distance D1.

Two zones are distinguished in pusher 7 neighbors, including a first pusher zone 7, called anterior zone 71 and intended to be fitted in machine 4 and its spindle 3, and a second pusher zone 7 which, called zone posterior 72, is attached to the first device 9.

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The anterior zone 71 has a length that, called usable length of pusher 7, it is at least enough to move the front end 8 between, by a part, the entrance 100 of the passage 10 aligned on the spindle 3 and, on the other hand, substantially the spindle head 30.

The rear area 72 has a dimension longitudinal which is at least sufficient to procure the link with a mobile organ 73 of the first device 9.

Significantly:

- pusher 7 comprises at least one first part 74 presenting the anterior end 8 and a second part 75 that is attached to the first device 9 and these two parts, jointly called sliding parts 74, 75, they are mounted sliding one inside the other in order to be mobile one respect to the other according to an axis called sliding axis 76, all this  between two situations, between them

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a first situation that, called contraction situation 77, corresponds to a situation wherein one (74) of said sliding parts 74, 75 is retracted into the other (75), giving pusher 7 a Usable length of a minimum value, and

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a second situation that, called extension situation 78, corresponds to a situation in  which one (74) of said sliding parts 74, 75 extends partially out of the other (75), all for a distance of extension D2 whose value is predetermined, conferring to the pusher 7 a usable length of a maximum value.

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The subject matter expert is considered to be trained to choose the extension distance D2 in such a way that the pusher 7 can provide the function of loading bar 2 on a machine 4 whose loading distance D1 is given, is say known.

The expert in the matter implicitly positions installation 1 at a distance of machine 4 that allows to exploit the characteristics of this installation 1.

As a reminder, the pusher dimension 7 called "usable length of pusher 7" corresponds to the longitudinal dimension of the anterior area 71 of the pusher 7 that can be used effectively to push a bar 2 inside a machine 4 and its spindle 3.

Significantly:

- the sliding parts 74, 75 are subjected to the control of a controlled device that, called second device 12, allows to influence the transition of pusher 7 of its contraction situation 77 to its extension situation 78 and reciprocally,

- the first device 9 and the second device 12 are subject to the control of a device control that, called third device 13, allows less, at the end of one of the two operations that are, for one part, the loading operation of the bar 2 in the machine 4 and, by another part, a scroll operation of the bar 2 within said machine 4 in a value, called first value, necessary for  the realization of a product 11, take into account the actual length of that bar 2 at the time of the operation in question and check by calculation if the usable length of the pusher 7 in question, in a situation of contraction 77, it is sufficient to procure at least one of the two operations consisting of

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effectively move the bar 2 to carry its second end 202 substantially up to within spindle head 30, and

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effectively move the bar 2 in a fraction of its length that corresponds to the necessary value to make a product 11, and

if the usable length of the pusher in contraction situation 77 is of sufficient value, keep then such a contraction situation 77 and if, on the contrary, the usable length is insufficient, then send the translation relative of the sliding parts 74, 75 of the pusher 7 for obtain extension situation 78 of this pusher 7.

Classically, installation 1 incorporates a control set of the different functional devices that this comprises and, advantageously, the third device 13 is constituted by this command set.

The expression "move bar 2 to bring its second end 202 noticeably up to inside the head of spindle 30 "means that the second end 202 is found sufficiently embedded in spindle head 30 to enable the realization of a product 11, namely the machining of such product 11.

These technical characteristics allow to obtain the essential result intended by the invention, namely a installation 1 of the aforementioned type which, by its construction, can be adapted to work with a machine 4 with which was initially compatible, but whose distance from D1 load has been increased beyond a tolerance interval of possible operation of an installation 1 initially planned  for this machine 4.

By the expression "allows to influence the transition of pusher 7 from its contraction situation 77 to its extension situation 78, and reciprocally, "designates a function consisting of:

- at least to enable the passage of the contraction situation 77 to extension situation 78 and reciprocally,

- at most to ensure the passage of the situation of contraction 77 to extension situation 78 and reciprocally.

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Significantly:

- installation 1 is equipped with a medium functional, on the one hand, of measuring the length of each bar 2 which has to be displaced by pusher 7 and, on the other hand, of production of a signal that reflects the measured length of this bar 2, and

- the third device 13, meanwhile, is constituted in order to

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exploit the signal that reflects the measured length of a bar 2 to be loaded on machine 4, all to calculate the real length of that bar 2 based on of the number of products 11 taken from said bar 2,

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exploit information that reflects the value of the distance that separates input 100 from passage 10 aligned on spindle 3 and spindle head 30, to know, the value of the loading distance D1,

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exploit information that reflects the value of the usable length of the pusher 7 in the time of a given operation, that is, the maximum value or the value minimum according to the pusher being extended 78 or in a situation of contraction 77.

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The information that reflects, on the one hand, the value of the load distance D1 and, on the other hand, the values maximum and minimum of the usable length of pusher 7 is stored in a memory

Although it does not appear in the figures, the third device 13 is the one that governs the first device 9 and the second device 12 in such a way as to ensure a functional phase of loading a bar 2, that is, a consistent functional phase in placing a bar 2 with its first end 201 in alignment with the pusher 7 face to face with the front end 8 of the pusher 7 (situation shown in figure 2).

Notably, the second device 12 allows to influence the transition of pusher 7 of one of its two situations, called contraction situation 77 and situation of extension 78, by hindering or enabling relative translation of these sliding parts 74, 75 under the effect of actions exteriors that tend to cause relative displacements of said sliding parts 74, 75.

These technical peculiarities allow contemplate an operation without having to resort to an organ Engine dedicated to this function.

Notably, to allow the pusher 7 adopt extension situation 78, the first is submitted  device 9 and the second device 12 under the control of a control device that, called third device 13, allows to control them in such a way that they seek at least following functional phases:

- a first functional phase in the course of which, on the one hand, when the anterior end 8 is located outside of machine 4 and, on the other hand, being the second part 75 of the pusher 7 in contraction situation 77 and immobilized in this position, pusher 7 is displaced in the first direction 91 with in order to make the front end 8 come into contact with the first end 201 of bar 2,

- a second functional phase in the course of which the bar 2 is moved inside the machine 4 at least until reach a displacement value at least equal to the extension distance D2 of the first part 74 and the second part 75 of pusher 7,

- a third functional phase in whose course the two sliding parts 74, 75 of translation are released relative, but the first part 74 of the pusher 7 is immobilized translation relative to a support 50 that is fixed with relation to pusher 7,

- a fourth functional phase in the course of which the movement of the pusher 7 is sent in the second direction 92 in order to cause relative displacement of the parts sliders 74, 75 to its extension situation 78,

- a fifth functional phase in the course of which, the sliding parts 74, 75 being situated in a situation of extension 78, these sliding parts 74, 75 are immobilized from relative translation,

- a sixth functional phase whose course is displaced the pusher 7 in order to resume feeding the machine 4.

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Significantly, the third device 13 allows to control the first device 9 and the second device 12 in such a way that at least one of the operations consisting of

effectively move bar 2 to carry its second end 202 substantially up to the spindle head 30, and

effectively move bar 2 in a fraction of its length that corresponds to the value needed for make a product 11,

come followed by an operation consisting of move the pusher 7 in the second direction 92 by an R value default and at least enough to delete the contact between the first end 201 of the bar 2 and the front end 8 of the pusher 7.

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These technical peculiarities allow suppress occasional axial stresses induced in bar 2 with reason for its displacement.

The support 50 is advantageously a subset in solidarity with the frame 5 of the installation 1.

The technical characteristics above listed allow you to build an installation 1 of the type previously mentioned that can be adapted to load a bar 2 on a machine 4 with which it was initially compatible, but whose load distance D1 has been increased beyond a possible operating range (not shown) of an installation 1 initially planned for this machine 4.

The extension distance D2 is chosen so that is greater than the value of the increase in load distance D1.

As already stated, installation 1 incorporates a control set of the different devices functional that this comprises and, advantageously, the third device 13 is constituted by this control assembly.

Significantly, the third device 13 governs the first device 9 and the second device 12 of such so that they try at least the following phases functional:

- a seventh functional phase in whose course pusher 7 is moved in the second direction 92 in order to remove the front end 8 of the machine 4,

- an eighth functional phase in whose course the sliding parts 74, 75 of relative translation are released, but the first part 74 of the pusher 7 is immobilized with relation to support 50,

- a ninth functional phase in the course of which the movement of the pusher 7 is sent in the first direction 91 in order to cause, on the one hand, a relative displacement of the sliding parts 74, 75 until their contraction situation 77 and, on the other hand, the relative immobilization of these parts sliders 74, 75 in this contraction situation 77,

- a tenth functional phase in the course of which pusher 7 is moved in the second direction 92 in order to get back in a position that allows a new cycle loading a bar 2 in machine 4, namely the position from which is displaced during the first phase functional.

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Thus, the sliding parts 74, 75 of the pusher 7 can be displaced relative to each other in the two opposite senses that are the first sense 91 and the second direction 92, between the extension position to the position of contraction, without having to provide a special motor organ to move them, such as a pneumatic cylinder or another.

The third device 13 governs the first device 9 and the second device 12 such that these seek at least an eleventh functional phase that lies between the seventh functional phase and the tenth functional phase and according to the which the front end 8 that carries a clamp is located in a post called ejection post (not shown), at whose level the section of bar 2 cannot be removed from said clamp usable.

This allows to preserve the operation conventional installation 1.

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The third device 13 governs the first device 9 and the second device 12 so as to, at the time of the third functional phase, immobilize the first part 74 of the pusher 7 relative to support 50.

The third device 13 governs the first device 9 and the second device 12 in order to, at the time of the eighth functional phase, immobilize the first part 74 of the pusher 7 relative to the support 50 and release the two parts sliders 74, 75 relative translation.

According to an embodiment of the second device 12:

- one of the sliding parts 74, 75 carries by at least two stops, jointly called stops, which exert a translation stop function according to the sliding axis 76, and these stops, called contraction stop 770 one and stop of extension 780 the other, are arranged with a certain distance D3 to define each, respectively, the contraction situation 77 and extension situation 78,

- the other sliding part is equipped with a element, called immobilization element 79, intended for selectively cooperate with the contraction stop 770 and the extension stop 780, in order to immobilize the two parts sliders 74, 75 relative to each other,

- the immobilization element 79 is

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retractable between a first position 791, in which it enables the relative sliding of the two sliding parts 74, 75, and a second position 792, in the which can, through a male part, called the first male part 793, cooperate with one of the two stops, which are the top of contraction 770 and extension stop 780, and thus hinder the relative sliding of said sliding parts 74, 75,

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associated with a means of drive 1300 between, on the one hand, the second position 792, in  which cooperates with one of the two stop stops, which are the stop of contraction 770 and extension stop 780, to obstruct thus the relative sliding of the sliding parts 74, 75 and, on the other hand, the first position 791, in which it is released from any one of said stops to enable sliding of the two sliding parts 74, 75.

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These technical characteristics allow guarantee the perfect immobilization of relative translation of sliding parts of the pusher or, conversely, ensure that They are effectively free of relative translation.

According to a preferred embodiment:

- the sliding parts 74, 75, namely the first part 74 and second part 75 are constituted by at least partially hollow pieces, the first part being 74 in sliding assembly in the second part 75,

- the second part 75 carries the two stops, which they are the contraction stop 770 and the extension stop 780, and each one of these two stops is constituted by the side face of a perforation performed on the wall of said second part 75, in order to constitute a translation stop stop along the axis of slip 76,

- the first part 74 houses the immobilization element 79, such that this element of immobilization 79 is mobile in a radial plane to the axis of slip 76, all between the two situations called first position 791 and second position 792, including

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a first position 791 in the which does not cooperate with either of the two stops, which are the top of contraction 770 and extension stop 780, and thus enable relative sliding of the two sliding parts 74, 75, Y

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a second position 792 in the which cooperates with one of the two stops and thus hinders the relative slippage of said first part 74 and second part 75,

- the drive means 1300 comprises, by a part, an elastic organ 130 that requests the element of Immobilization 79 towards its second position 792 and, on the other hand, a drive apparatus 131 which is governed to move the immobilization element 79 to its first position 791.

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The elastic member 130 consists advantageously In a spring

These features allow you to adapt Easily an existing pusher.

The actuator 131 is supported by the support 50 and comprises:

- on the one hand, an organ that, called actuator 132, is arranged to operate on the immobilization element 79 at least through one of the perforations of the wall of the second part 75 and displace this immobilization element 79 from its second position 792 towards its first position 791,

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- on the other hand, another body that, called motor organ 133, is of controlled type and is associated with the organ drive 132 to be able to move it in such a way that, by one part, push the immobilization element 79 of your second position 792 towards its first position 791 and, on the other hand, enable reverse displacement of this immobilization organ 79 under the effect of elastic organ 130 that requests it.

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The drive organ consists advantageously in a cylinder.

The two perforations that are made in the wall of the second part 75 of the pusher 7 to form the two stops, which are the contraction stop 770 and the extension stop 780, are joined by a slot 14 and this slot 14, by a part is oriented along the sliding axis 76 and, on the other part, has a transverse dimension adjusted to that of a part male who, called second male part 1321, is supported by the actuator 132 of the immobilization element 79 of such so that when it triggers the immobilization element 79 in its first position 791, said second male part 1321 cooperates, by one part, with a female support area 7931 conditioned axially in the first male part 7 93 of the element of immobilization 79 and, on the other hand, with the groove and, thereby, guarantees at the same time:

- the immobilization of translation of the first part 74 in relation to the fixed support 50, and

- the relative orientation of part one 74 and of the second part 75 around the sliding axis 76, all this at least between the contraction situation 77 and the extension situation 78 of the two sliding parts 74, 75.

Claims (13)

1. Installation (1) for sequential loading of material bars, called bars (2), on a spindle (3) of a machine (4) for machining these bars (2), the installation (1) comprising an elongated organ which, called pusher (7): - has an end that, called an end previous (8), is intended to take an action on one of the opposite ends of a bar (2), called first end (201), in order to procure the translational displacement of that bar (2), - is subject to the control of a device called first device (9) and able to procure the displacement of this pusher (7) in two-way translation opposites, called first sense (91) and second sense (92), to in order to move the front end (8), in the first direction (91), towards the inside of the machine (4) or, in the second direction (92), into the installation (1) and be able to

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in the first sense (91), do that this anterior end (8) comes into contact with the first end (201) of a bar (2) previously aligned with the pusher (7) and ensure contact with this first end (201), so that, at most, after the bar (2) has been fitted, by another end called second end (202), by the entrance (100) of a passage (10) presenting the machine (4) in alignment with its spindle (3) and even inside a spindle component (3), called spindle head (30), and at whose level said bar (2) can be held firmly in order to enable the machining of a fraction (20) protruding from this head of spindle (30),

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also in the first sense (91), sequentially move the leading end (8) in order to move the bar (2) by fraction of its length, in particular in order to mechanize and then take products (11) successively of this bar (2),

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in the second sense (92), remove the front end (8) of the pusher (7) from the machine (4) in order to enable a new offset of the leading end (8) in the first direction (91) towards a first end (201) of a new bar (2) previously loaded, that is, previously aligned on this anterior end (8) with a view to a new cycle of loading and moving operations of a bar (2),

- comprising the pusher (7) at least a first part (74) presenting the anterior end (8) and a second part (75) that is attached to the first device (9), and these two parts, jointly referred to as sliding parts (74), (75), they go in sliding assembly one inside the other in order to be mobile relative to each other along an axis called the axis of sliding (76), all between two situations, including

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a first situation that, called contraction situation (77), corresponds to a situation in which one (74) of said sliding parts (74), (75) is retracted into the other (75), conferring on the pusher (7) a usable length to move the leading end (8) between the entrance (100) of the passage (10) aligned on the spindle (3) and the spindle head (30), which is of a minimum value, Y

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a second situation that, called extension situation (78), corresponds to a situation wherein one (74) of said sliding parts (74), (75) is extends partially out of the other (75), all by one extension distance (D2) whose value is predetermined, giving the pusher (7) a usable length of a value maximum,

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this installation being characterized because: - the sliding parts (74), (75) are under control of a controlled device that, called second device (12), allows to influence the transition of the pusher (7) from its contraction situation (77) to its situation of extension (78) and reciprocally, - the first device (9) and the second device (12) are subject to the control of a device control that, called third device (13), allows less, at the end of one of the two operations that are, for one part, the loading operation of the bar (2) on the machine (4) and, on the other hand, a bar scroll operation (2) within said machine (4) in a value, called first value, necessary for the realization of a product (11), take into account the actual length of this bar (2) at the time of operation in issue and check by calculation if the usable length of the pusher (7) in question, in a contraction situation (77), is enough to procure at least one of the two operations consisting of

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effectively move the bar (2) to carry its second end (202) substantially inside of the spindle head (30) and

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effectively move the bar (2) in a fraction of its length that corresponds to the value necessary to make a product (11), and

if the usable length of the pusher in contraction situation (77) is of sufficient value, keep then such a contraction situation (77) and if, on the contrary, the usable length is insufficient, then send the relative translation of the sliding parts (74), (75) of the pusher (7) to obtain the extension situation (78) of this pusher (7).

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2. Installation according to claim 1, characterized in that: - on the one hand, it (1) is equipped with a functional means, on the one hand, of measuring the length of each bar (2) that has to be displaced by the pusher (7) and, by another part, of producing a signal that reflects the length measure of this bar (2) and - on the other hand, the third device (13), is constituted by you in order to

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exploit the signal that reflects the measured length of a bar (2) to be loaded in the machine (4), all to calculate the real length of this bar (2) in function of the number of products (11) taken from said bar (2),

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exploit information that reflects the value of the distance that separates the input (100) from the passage (10) aligned on the spindle (3) and the spindle head (30), namely the value of the loading distance (D1),

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exploit information that reflects the value of the usable length of the pusher (7) in the time of a given operation, that is, the maximum value or the value minimum according to the pusher being extended (78) or in a contraction situation (77).

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3. Installation according to claim 1 or 2, characterized in that the second device (12) allows to influence the transition of the pusher (7) of one of its two situations, called contraction situation (77) and extension situation (78), by obstructing or enabling the relative translation of these sliding parts (74), (75) under the effect of external actions that tend to cause relative displacements of said sliding parts (74), (75). 4. Installation according to one of claims 1 to 3, characterized in that, to allow the pusher (7) to adopt the extension situation (78), the first device (9) and the second device (12) are subjected to the control of a control device that, called third device (13), allows them to be controlled in such a way that they attempt at least the following functional phases: - a first functional phase in the course of which, on the one hand, when the front end (8) is located outside of the machine (4) and, on the other hand, being the second part (75) of the pusher (7) in a contraction situation (77) and immobilized in this position, the pusher (7) is displaced in the first sense (91) in order to make the leading end (8) between in contact with the first end (201) of the bar (2), - a second functional phase in the course of which the bar (2) is moved inside the machine (4) at least until reaching a displacement value at least equal to the extension distance (D2) of the first part (74) and of the second part (75) of the pusher (7), - a third functional phase in whose course the two sliding parts (74), (75) of translation are released relative, but the first part (74) of the pusher (7) is translation immobilized with respect to a support (50) that is fixed relative to the pusher (7), - a fourth functional phase in the course of which pusher displacement (7) is sent in the second direction (92) in order to cause relative displacement of the parts sliders (74), (75) to their extension situation (78), - a fifth functional phase in the course of which, the sliding parts (74), (75) being situated in a situation of extension (78), these sliding parts (74), (75) are fixed translation assets, - a sixth functional phase whose course is displaced the pusher (7) in order to resume feeding the machine (4). 5. Installation according to any one of claims 1 to 4, characterized in that the third device (13) allows the first device (9) and the second device (12) to be controlled such that at least one of the operations consisting of effectively move the bar (2) to carry its second end (202) substantially within the spindle head (30) and effectively move the bar (2) in a fraction of its length that corresponds to the necessary value to make a product (11), come followed by an operation consisting of move the pusher (7) in the second direction (92) by a value (R) default and at least enough to suppress the contact between the first end (201) of the bar (2) and the end front (8) of the pusher (7). 6. Installation according to any one of claims 4 to 5, characterized in that the third device (13) governs the first device (9) and the second device (12) in such a way as to ensure at least the following functional phases: - a seventh functional phase in whose course the pusher (7) is moved in the second direction (92) with in order to remove the front end (8) of the machine (4), - an eighth functional phase in whose course the sliding parts (74), (75) of translation are released relative, but the first part (74) of the pusher (7) is immobilized in relation to the support (50), - a ninth functional phase in the course of which pusher displacement (7) is sent in the first direction (91) in order to cause, on the one hand, a displacement relative of the sliding parts (74), (75) until their situation of contraction (77) and, on the other hand, the relative immobilization of these sliding parts (74), (75) in this situation of contraction (77), - a tenth functional phase in the course of which the pusher (7) is moved in the second direction (92) in order to get back in a position that allows a new cycle loading a bar (2) into the machine (4), namely the position from which it is displaced during the first phase functional. 7. Installation according to claim 6, characterized in that the third device (13) governs the first device (9) and the second device (12) such that these provide at least an eleventh functional phase that is located between the seventh phase functional and the tenth functional phase and according to which the front end (8) that carries a clamp is located in a position called ejection post (not shown), at which level the bar section (2) can be extracted from said clamp not usable 8. Installation according to any one of claims 4 to 7, characterized in that the third device (13) governs the first device (9) and the second device (12) so as to, at the time of the third functional phase, immobilize the first part (74) of the pusher (7) in relation to the support (50). 9. Installation according to any one of claims 4 to 8, characterized in that the third device (13) governs the first device (9) and the second device (12) so as to, at the time of the eighth functional phase, immobilize the first part (74) of the pusher (7) relative to the support (50) and release the two sliding parts (74), (75) of relative translation. 10. Installation according to any one of claims 1 to 9, characterized in that, to realize the second device (12): - one of the sliding parts (74), (75) carries at least two stops, jointly called stops, which they perform a translation stop function along the axis of sliding (76), and these stops, called the contraction stop (770) one and extension stop (780) the other, are arranged with a certain distancing (D3) to define each one, respectively, the contraction situation (77) and the extension situation (78), - the other sliding part is equipped with a element, called immobilization element (79), intended to selectively cooperate with the contraction stop (770) and the extension stop (780), in order to immobilize the two sliding parts (74), (75) relative to each other, - the immobilization element (79) is

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retractable between a first position (791), in which it enables the relative sliding of the two sliding parts (74), (75), and a second position (792), in which can, through a male part, called the first part male (793), cooperate with one of the two stops, which are the top of contraction (770) and extension stop (780), and thus hinder the relative sliding of said sliding parts (74), (75),

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associated with a means of drive (1300) between, on the one hand, the second position (792), in which it cooperates with one of the two stop stops, which they are the contraction stop (770) and the extension stop (780), for thus hinder the relative sliding of the sliding parts (74), (75) and, on the other hand, the first position (791), in which it is released from any one of said stops to enable the sliding of the two sliding parts (74), (75).

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11. Installation according to claim 10, characterized in that: - the sliding parts (74), (75), namely the first part (74) and the second part (75) are constituted by at least partially hollow pieces, the first part being (74) in sliding assembly in the second part (75), - the second part (75) carries the two stops, which they are the contraction stop (770) and the extension stop (780), and each of these two stops is constituted by the lateral face of a perforation made in the wall of said second part (75), in order to constitute a translation stop stop along the axis of slip (76), - the first part (74) internally houses the immobilization element (79), such that this element of immobilization (79) is mobile in a radial plane to the axis of sliding (76), all between the two situations called first position (791) and second position (792), including

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a first position (791) in the which does not cooperate with either of the two stops, which are the top of contraction (770) and extension stop (780), and thus enable the relative sliding of the two sliding parts (74), (75), Y

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a second position (792) in the which cooperates with one of the two stops and thus hinders the relative sliding of said first part (74) and second part (75),

- the drive means (1300) comprises, on the one hand, an elastic organ (130) that requests the element of immobilization (79) towards its second position (792) and, on the other part, a drive apparatus (131) that is governed to move the immobilization element (79) to its first position (791).

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12. Installation according to claim 11, characterized in that the actuator (131) is supported by the support (50) and comprises: - on the one hand, an organ that, called actuator (132), is arranged to operate on the immobilization element (79) at least through one of the perforations of the wall of the second part (75) and displace this immobilization element (79) from its second position (792) towards his first position (791), - on the other hand, another body that, called motor organ (133), is of controlled type and is associated with the organ drive (132) to be able to move it in such a way that, by one part, push the immobilization element (79) of its second position (792) towards its first position (791) and, on the other hand, enable reverse displacement of this immobilization organ (79) under the effect of the elastic organ (130) that requests it. 13. Installation according to claim 12, characterized in that the two perforations that are made in the wall of the second part (75) of the pusher (7) to form the two stops, which are the contraction stop (770) and the stop of extension (780), are joined by a groove (14) and this groove (14), on the one hand, is oriented along the sliding axis (76) and, on the other hand, has a transverse dimension adjusted to that of a part male which, called second male part (1321), is supported by the actuator (132) of the immobilization element (79) such that, when it activates the immobilization element (79) in its first position (791) , said second male part (1321) cooperates, on the one hand, with a female support zone (7931) axially conditioned in the first male part (793) of the immobilization element (79) and, on the other hand, with the groove and By doing so, it guarantees at the same time: - the immobilization of translation of the first part (74) in relation to the fixed support (50), and - the relative orientation of the first part (74) and the second part (75) around the sliding axis (76), all at least between the contraction situation (77) and the extension situation (78) of the two sliding parts (74), (75).